str1='111'
print(str1)
str2='222'
print('{0}----{1}-----{2}'.format(1,2,3))
str3='6666'
print(f'这个程序{str3}')
i=2
j=3
print(f'{i}*{j}={i*j}')

sep='*'
print(sep.join(str3))


str4='good good study'
print(str4.upper())
print("good".center(30,'*'))
word='o'
result=str4.find(word)
print(result)

for i in str4:
    print(i,end='')
